When I attempt to display kanji a Label on Android, it gets displayed as Chinese instead of Japanese
For example, the difference between the character "直" in Chinese and Japanese:
(see here for more examples)
According to this post, Android chooses the default based on whether or not the user has Japanese installed as a language.
Is there any way to tell it to pick the Japanese encoding?
A solution involving a custom renderer:
Android project:
[assembly: ExportRenderer(typeof(Label), typeof(JapaneseLabelRenderer))]
namespace MyProject.Controls
{
public class JapaneseLabelRenderer : LabelRenderer
{
public JapaneseLabelRenderer(Context context) : base(context) { }
protected override void OnElementChanged(ElementChangedEventArgs<Label> e)
{
base.OnElementChanged(e);
Control.TextLocale = Locale.Japan;
}
}
}
Related
Hello I am creating an application in xamarin which allows the user to listen to the sounds of the texts in English and in French, but I found that in English it works but in French no sound of the texts here are my codes :
public class ActivityA : AppCompatActivity,TextToSpeech.IOnInitListener
{
private TextToSpeech tts;
private TextToSpeech tts1;
protected override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
tts = new TextToSpeech(this, this);
tts1 = new TextToSpeech(this, this);
}
private void TxtProv3b_Click(object sender, EventArgs e)
{
//In french
tts1.Speak("A méchant ouvrier, point de bons outils", QueueMode.Flush, null);
}
private void TxtProv1_Click(object sender, EventArgs e)
{
// In english
tts.Speak("A bad excuse is better than none", QueueMode.Flush, null);
}
public void OnInit([GeneratedEnum] OperationResult status)
{
if (status == OperationResult.Success)
{
tts.SetLanguage(Locale.Us);
tts1.SetLanguage(Locale.French);
}
}
}
i need help please
Text to speech is not quite the reverse of speech to text and relies
on two key components; a text-to-speech engine being installed on the
device and a language being installed.
So you could check if French voice data was download.You could use
Java.Util.Locale.GetAvailableLocales().ToList(); to test against the installed languages.
The more information you could refer to the doc.
Anyone can share them a workaround for this bug, I also need to implement the Localization for Datepicker,
I implementing the Localization in this link https://learn.microsoft.com/en-us/xamarin/xamarin-forms/app-fundamentals/localization/text?tabs=windows
Then Translate and Change the Culture using this
public void SetLocale(CultureInfo ci)
{
Thread.CurrentThread.CurrentCulture = ci;
Thread.CurrentThread.CurrentUICulture = ci;
Console.WriteLine("CurrentCulture set: " + ci.Name);
}
But the app still using the Device OS culture setting.
I also try Custom Renderer.
public class CustomDatePickerRenderer : DatePickerRenderer
{
public CustomDatePickerRenderer(Context context) :base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.DatePicker> e)
{
base.OnElementChanged(e);
Locale locale = new Locale("ARA");
Control.TextLocale = locale;
Resources.Configuration.SetLocale(locale);
Resources.Configuration.Locale = locale;
Resources.Configuration.SetLayoutDirection(locale);
}
}
Using a custom renderer one can disable the swiping gesture of an CarouselPage on iOS like so:
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
[assembly: ExportRenderer(typeof(CarouselPage), typeof(CustomCarouselPageRenderer))]
namespace App.iOS
{
public class CustomCarouselPageRenderer : CarouselPageRenderer
{
protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
UIView view = this.NativeView;
UIScrollView scrollView = (UIKit.UIScrollView)view.Subviews[0];
scrollView.ScrollEnabled = false;
}
}
}
How to accomplish the same on Android?
using Android.Content;
using XamFormsApp.Droid.Renderers;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android;
[assembly: ExportRenderer(typeof(CarouselPage), typeof(CustomCarouselPageRenderer))]
namespace StixApp.Droid.Renderers
{
public class CustomCarouselPageRenderer : VisualElementRenderer<CarouselPage>
{
public CustomCarouselPageRenderer(Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<CarouselPage> e)
{
base.OnElementChanged(e);
var view = this.RootView;
X
X
}
}
}
There appears to be no way to access Subviews in the same way. One can access Children like so
Android.Views.View view = (Android.Views.View)GetChildAt(i);
How to know which Child is ScrollView if any?
Using a loop to check for this, like so,
for (int i = 0; i < ChildCount; ++i)
{
Android.Views.View view = (Android.Views.View)GetChildAt(i);
if (view is ScrollView)
{
}
}
Yields the following: "The given expression is never of the provided (ScrollView) type"
So! How to disable CarouselPage swipe/scrolling as is done in iOS quite elegantly?
UPDATE: Please see sample solution.
A couple of things.
For Android the view you are looking for is not a ScrollView but a ViewPager.
This can be found under the index 0 with the GetChildAt method.
Also, why are you using VisualElementRenderer<CarouselPage> as the parent class of your CustomCarouselPageRenderer. Instead use the CarouselPageRenderer as you did with iOS.
One last thing is that on Android the Scroll of a ViewPager cannot be disabled. To get this behavior you can listen to the Touch event. Setting the Handled property of TouchEventArgs to true will prevent the scrolling from happening.
Your whole class would look something like:
[assembly: ExportRenderer(typeof(CarouselPage), typeof(CustomCarouselPageRenderer))]
namespace StixApp.Droid.Renderers
{
public class CustomCarouselPageRenderer : CarouselPageRenderer
{
private bool _canScroll = false;
public CustomCarouselPageRenderer(Context context) : base(context)
{
}
public CustomCarouselPageRenderer()
{
}
protected override void OnElementChanged(ElementChangedEventArgs<CarouselPage> e)
{
base.OnElementChanged(e);
if (this.ChildCount > 0 && this.GetChildAt(0) is ViewPager viewPager)
{
viewPager.Touch -= ViewPagerTouched;
viewPager.Touch += ViewPagerTouched;
}
}
private void ViewPagerTouched(object sender, TouchEventArgs e)
{
e.Handled = !_canScroll;
}
}
}
Just change the value of _canScroll to true to allow the scrolling.
Hope this helps.-
Overridden Methods in ViewPager class:
public class NonSwipeableViewPager : ViewPager
{
public override bool OnTouchEvent(MotionEvent e)
{
return false;
}
public override bool OnInterceptTouchEvent(MotionEvent ev)
{
return false;
}
public override bool ExecuteKeyEvent(KeyEvent ev)
{
return false;
}
}
Changes to CarouselPageRenderer:
In class declaration:
public class MyCarouselPageRenderer : VisualElementRenderer<CarouselPage>
{
NonSwipeableViewPager _viewPager;
}
In OnElementChanged:
protected override void OnElementChanged(ElementChangedEventArgs<CarouselPage> e)
{
_viewPager = new NonSwipeableViewPager(Context);
}
Note: CarouselPageAdapter, CarouselPageRenderer, MeasureSpecFactory, ObjectJavaBox, and PageContainer all had to be copied from the Xamarin.Forms github to enable a custom CarouselPageRenderer implementation. All of this is in the github sample but hopefully this spells it out more clearly for future visitors.
Note2: I would like to stress that the true behavior we were trying to achieve is probably best done with a NavigationPage as this allows us to easily pop and push any and all pages at any time without having to address the swipe issue. That being said, hopefully this solution serves to aid anyone who need this behavior on a CarouselPage.
I am new to MVVMCross. I need to get details about whether my android application is running in background or not. To achieve this i have try to implement with IActivityLifecycleCallbacks with MVXApplication.But i get following error "implements Android.Runtime.IJavaObject but does not inherit Java.Lang.Object or Java.Lang.Throwable. This is not supported.". So could anyone suggest me to how to achieve my requirement with MVVM cross.
You can implement that interface in your main application of your Android project and on the OnTrimMemory comparing the level with TrimMemory.UiHidden you can know if the app is in background or not.
public class MainApplication : Application, Application.IActivityLifecycleCallbacks
{
...
public static bool IsApplicationInForeground { get; private set; }
public override void OnCreate()
{
base.OnCreate();
this.RegisterActivityLifecycleCallbacks(this);
}
public override void OnTerminate()
{
base.OnTerminate();
this.UnregisterActivityLifecycleCallbacks(this);
}
public virtual void OnActivityResumed(Activity activity)
{
IsApplicationInForeground = true;
}
public override void OnTrimMemory(TrimMemory level)
{
IsApplicationInForeground &= level != TrimMemory.UiHidden;
base.OnTrimMemory(level);
}
...
}
IDK if it covers all of the cases but I use it in my projects and it works like a charm in the scenarios I've tested
HIH
Using the Xamarin Forms WebView control, I'm overriding the OnBackButtonPressed() and finding that the CanGoBack always returns false in UWP.
I don't see this problem in Android.
Is this a XF bug or am I doing something wrong?
Note: I'm running XF v2.3.3.193
EDIT: I upgraded to XF 2.3.4.247 and the problem persists.
I have created a code sample and reproduce your issue when the WebView browse several website. And I have found reason in the Xamarin.Forms source code.
void UpdateCanGoBackForward()
{
((IWebViewController)Element).CanGoBack = Control.CanGoBack;
((IWebViewController)Element).CanGoForward = Control.CanGoForward;
}
The CanGoBack property will be changed when UpdateCanGoBackForward method invoked. And UpdateCanGoBackForward method was called only when the native NavigationCompleted event was invoked. So if some website could not be loaded quickly, the CanGoBack property would not be changed.
You can improve this design by custom WebView. And you could follow the code below.
CustomWebView.cs
Add the new property for CustomWebView.
public class CustomWebView : WebView
{
public bool CCanGoBack { get; set; }
public CustomWebView()
{
}
}
CustomWebViewRenderer.cs
And change the property when the ContentLoading event invoked.
[assembly: ExportRenderer(typeof(CustomWebView), typeof(CustomWebViewRenderer))]
namespace CustomWebViewTest.UWP
{
public class CustomWebViewRenderer : WebViewRenderer
{
protected override void OnElementChanged(ElementChangedEventArgs<WebView> e)
{
base.OnElementChanged(e);
if (Control != null)
{
Control.ContentLoading += Control_ContentLoading;
}
}
private void Control_ContentLoading(Windows.UI.Xaml.Controls.WebView sender, Windows.UI.Xaml.Controls.WebViewContentLoadingEventArgs args)
{
(Element as CustomWebView).CCanGoBack = Control.CanGoBack;
}
}
}
MainPage.cs
private void backClicked(object sender, EventArgs e)
{
if (Browser.CCanGoBack)
{
Browser.GoBack();
}
}